Which member of the ground crew is not needed when using the cargo hook reach pendant?

The static discharge person is not needed when using the cargo hook reach pendant because this role primarily focuses on ensuring that any static electricity is discharged before handling sensitive equipment or materials, especially in specific operations like aircraft refueling or when working with explosives. In the context of using a cargo hook reach pendant, the primary concerns revolve around effectively and safely attaching and releasing loads from the helicopter, which does not require the presence of a static discharge person.

In contrast, the loadmaster's role is critical as they are responsible for managing the load's weight distribution and ensuring it is properly rigged. The signal person is also essential as they provide clear communication to the helicopter crew during lift operations to ensure safety and coordination. The safety officer plays a key role in overseeing the entire operation, ensuring adherence to safety protocols. Thus, while all other roles contribute directly to the safety and effectiveness of the lift, the static discharge function is not necessary in this specific scenario.